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Date: Fri, 20 Apr 2007 15:59:21 +0400
From: Anton Vorontsov <cbou@...l.ru>
To: linux-kernel@...r.kernel.org
Cc: kernel-discuss@...dhelds.org
Subject: [PATCH 5/7] APM emulation driver for class batteries
It's still tristate, but now on module removal it will set
apm get status function to NULL, to not cause oops if two APM
modules loaded/unloaded in special order.
Fixing APM API itself is another story.
Signed-off-by: Anton Vorontsov <cbou@...l.ru>
---
drivers/battery/Kconfig | 7 ++
drivers/battery/Makefile | 1 +
drivers/battery/apm_power.c | 228 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 236 insertions(+), 0 deletions(-)
create mode 100644 drivers/battery/apm_power.c
diff --git a/drivers/battery/Kconfig b/drivers/battery/Kconfig
index 0c14ae0..5e2dac8 100644
--- a/drivers/battery/Kconfig
+++ b/drivers/battery/Kconfig
@@ -15,4 +15,11 @@ config BATTERY_DS2760
help
Say Y here to enable support for batteries with ds2760 chip.
+config APM_POWER
+ tristate "APM emulation"
+ depends on BATTERY && APM_EMULATION
+ help
+ Say Y here to enable support APM status emulation using
+ battery class devices.
+
endmenu
diff --git a/drivers/battery/Makefile b/drivers/battery/Makefile
index 9902513..cea5807 100644
--- a/drivers/battery/Makefile
+++ b/drivers/battery/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_BATTERY) += battery.o
obj-$(CONFIG_BATTERY_DS2760) += ds2760_battery.o
+obj-$(CONFIG_APM_POWER) += apm_power.o
diff --git a/drivers/battery/apm_power.c b/drivers/battery/apm_power.c
new file mode 100644
index 0000000..e3bb4bd
--- /dev/null
+++ b/drivers/battery/apm_power.c
@@ -0,0 +1,228 @@
+/*
+ * Copyright (c) 2007 Anton Vorontsov <cbou@...l.ru>
+ * Copyright (c) 2007 Eugeny Boger <eugenyboger@...p.mipt.ru>
+ *
+ * Author: Eugeny Boger <eugenyboger@...p.mipt.ru>
+ *
+ * Use consistent with the GNU GPL is permitted,
+ * provided that this copyright notice is
+ * preserved in its entirety in all copies and derived works.
+ */
+
+#include <linux/module.h>
+#include <linux/battery.h>
+#include <linux/apm-emulation.h>
+
+#ifdef current
+#undef current /* it expands to get_current() */
+#endif
+
+#define BATTERY_PROP(bat, prop) ({ \
+ void *value = bat->get_property(bat, BATTERY_PROP_##prop); \
+ value ? *(int*)value : 0; \
+})
+
+#define MBATTERY_PROP(prop) main_battery->get_property(main_battery, \
+ BATTERY_PROP_##prop)
+
+static struct battery *main_battery;
+
+static void find_main_battery(void)
+{
+ struct device *dev;
+ struct battery *bat, *batm;
+ int max_charge = 0;
+
+ main_battery = NULL;
+ batm = NULL;
+ list_for_each_entry(dev, &battery_class->devices, node) {
+ bat = dev_get_drvdata(dev);
+ /* If none of battery devices cantains 'main_battery' flag,
+ choice one with maximum design charge */
+ if (BATTERY_PROP(bat, CHARGE_FULL_DESIGN) > max_charge) {
+ batm = bat;
+ max_charge = BATTERY_PROP(bat, CHARGE_FULL_DESIGN);
+ }
+
+ if (bat->main_battery)
+ main_battery = bat;
+ }
+ if (!main_battery)
+ main_battery = batm;
+
+ return;
+}
+
+static int calculate_time(int status)
+{
+ int *charge_full;
+ int *charge_empty;
+ int *charge;
+ int *current;
+
+ charge_full = MBATTERY_PROP(CHARGE_FULL);
+ /* if battery can't report this property, use design value */
+ if (!charge_full)
+ charge_full = MBATTERY_PROP(CHARGE_FULL_DESIGN);
+
+ charge_empty = MBATTERY_PROP(CHARGE_EMPTY);
+ /* if battery can't report this property, use design value */
+ if (!charge_empty)
+ charge_empty = MBATTERY_PROP(CHARGE_EMPTY_DESIGN);
+
+ charge = MBATTERY_PROP(CHARGE_AVG);
+ /* if battery can't report average value, use momentary */
+ if (!charge)
+ charge = MBATTERY_PROP(CHARGE_NOW);
+
+ current = MBATTERY_PROP(CURRENT_AVG);
+ /* if battery can't report average value, use momentary */
+ if (!current)
+ current = MBATTERY_PROP(CURRENT_NOW);
+
+ /* no luck */
+ if (!current || !charge || !charge_empty)
+ return -1;
+
+ if (status == BATTERY_STATUS_CHARGING)
+ return ((*charge - *charge_full) * 60L) / *current;
+ else
+ return -((*charge - *charge_empty) * 60L) / *current;
+}
+
+/* TODO: teach this function to calculate battery life using energy */
+static int calculate_capacity(void)
+{
+ int ret;
+ int *charge_empty;
+ int *charge_full;
+ int *charge;
+
+ charge_full = MBATTERY_PROP(CHARGE_FULL);
+ /* if battery can't report this property, use design value */
+ if (!charge_full)
+ charge_full = MBATTERY_PROP(CHARGE_FULL_DESIGN);
+
+ charge_empty = MBATTERY_PROP(CHARGE_EMPTY);
+ /* if battery can't report this property, use design value */
+ if (!charge_empty)
+ charge_empty = MBATTERY_PROP(CHARGE_EMPTY_DESIGN);
+
+ charge = MBATTERY_PROP(CHARGE_AVG);
+ /* if battery can't report average value, use momentary */
+ if (!charge)
+ charge = MBATTERY_PROP(CHARGE_NOW);
+
+ /* no luck */
+ if (!charge_full || !charge_empty || !charge)
+ return -1;
+
+ if (*charge_full - *charge_empty)
+ ret = ((*charge - *charge_empty) * 100L) /
+ (*charge_full - *charge_empty);
+ else
+ return -1;
+
+ if (ret > 100)
+ return 100;
+ else if (ret < 0)
+ return 0;
+ else
+ return ret;
+}
+
+static void apm_battery_apm_get_power_status(struct apm_power_info *info)
+{
+ int status;
+ int *capacity;
+ int *time_to_full;
+ int *time_to_empty;
+
+ down(&battery_class->sem);
+ find_main_battery();
+ if (!main_battery) {
+ up(&battery_class->sem);
+ return;
+ }
+
+ /* status */
+
+ if (MBATTERY_PROP(STATUS))
+ status = *(int *)MBATTERY_PROP(STATUS);
+ else
+ status = BATTERY_STATUS_UNKNOWN;
+
+ /* ac line status */
+
+ if ((status == BATTERY_STATUS_CHARGING) ||
+ (status == BATTERY_STATUS_NOT_CHARGING) ||
+ (status == BATTERY_STATUS_FULL))
+ info->ac_line_status = APM_AC_ONLINE;
+ else
+ info->ac_line_status = APM_AC_OFFLINE;
+
+ /* battery life (i.e. capacity, in percents) */
+
+ capacity = MBATTERY_PROP(CAPACITY);
+ if (capacity)
+ info->battery_life = *capacity;
+ else
+ info->battery_life = calculate_capacity();
+
+ /* charging status */
+
+ if (status == BATTERY_STATUS_CHARGING)
+ info->battery_status = APM_BATTERY_STATUS_CHARGING;
+ else {
+ if (info->battery_life > 50)
+ info->battery_status = APM_BATTERY_STATUS_HIGH;
+ else if (info->battery_life > 5)
+ info->battery_status = APM_BATTERY_STATUS_LOW;
+ else
+ info->battery_status = APM_BATTERY_STATUS_CRITICAL;
+ }
+ info->battery_flag = info->battery_status;
+
+ /* time */
+
+ info->units = APM_UNITS_MINS;
+
+ time_to_empty = MBATTERY_PROP(TIME_TO_EMPTY_AVG);
+ if (!time_to_empty)
+ time_to_empty = MBATTERY_PROP(TIME_TO_EMPTY_NOW);
+
+ time_to_full = MBATTERY_PROP(TIME_TO_FULL_AVG);
+ if (!time_to_full)
+ time_to_full = MBATTERY_PROP(TIME_TO_FULL_NOW);
+
+ if (status == BATTERY_STATUS_CHARGING && time_to_full)
+ info->time = *time_to_full / 60;
+ else if (status != BATTERY_STATUS_CHARGING && time_to_empty)
+ info->time = *time_to_empty / 60;
+ else
+ info->time = calculate_time(status);
+
+ up(&battery_class->sem);
+ return;
+}
+
+static int __init apm_battery_init(void)
+{
+ printk(KERN_INFO "APM Battery Driver\n");
+
+ apm_get_power_status = apm_battery_apm_get_power_status;
+ return 0;
+}
+
+static void __exit apm_battery_exit(void)
+{
+ apm_get_power_status = NULL;
+ return;
+}
+
+module_init(apm_battery_init);
+module_exit(apm_battery_exit);
+
+MODULE_AUTHOR("Eugeny Boger <eugenyboger@...p.mipt.ru>");
+MODULE_DESCRIPTION("APM emulation driver for battery monitoring class");
+MODULE_LICENSE("GPL");
--
1.5.1.1-dirty
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